norbergite

Norbergite is a nesosilicate mineral with formula Mg3(SiO4)(F,OH)2. It is a member of the humite group.

Key facts

Mineral.2V: 44 – 50°
Mineral.streak: White
Mineral.gravity: 3.177
Mineral.name: Norbergite
Mineral.category: Nesosilicates
Mineral.image: Norbergite-Calcite-290476.jpg
Mineral.caption: Norbergite crystals on calcite from Oakssaung Hill, Mogok, Mandalay, Burma (size: 4.2 x 3.3 x 2.3 cm)
Mineral.boxbgcolor: b5691d
Mineral.boxtextcolor: FFFFFF
Mineral.formula: Mg3(SiO4)(F,OH)2
Mineral.IMAsymbol: Nrb
Mineral.molweight: 202.00 g/mol
Mineral.strunz: 9.AF.40
Mineral.system: Orthorhombic
Mineral.class: Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Mineral.symmetry: Pnma
Mineral.unit cell: a = 8.747(6), b = 4.710(4) c = 10.271(8) [Å]; Z = 4
Mineral.color: Tan, yellow, yellow-orange, orange-brown, pink with purplish tint, white

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Wikidata facts

Image: Norbergite-Calcite-290476.jpg

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Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 9.AF.40
chemical formula: Mg₃SiO₄F₂
Nickel-Strunz 9th edition (updated 2009): 9.AF.40
Commons category: Norbergite
IMA Mineral Symbol: Nrb
Strunz 8th edition (series ID, updated): VIII/A’.04

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Norbergite is a nesosilicate mineral with formula Mg3(SiO4)(F,OH)2. It is a member of the humite group.

It was first described in 1926 for an occurrence in the Östanmoss iron mine in Norberg, Västmanland, Sweden, for which it is named. It occurs in contact metamorphic zones in carbonate rocks intruded by plutonic rocks or pegmatites supplying the fluorine. Associated minerals include dolomite, calcite, tremolite, grossular, wollastonite, forsterite, monticellite, cuspidine, fluoborite, ludwigite, fluorite and phlogopite.